Expression of inducible HSP70 in the epithelium, crypts, and lamina propria of normal and UC tissue. a. Normal tissue. Epithelium. Negative normal surface epithelium (arrows). b. UC tissue. Crypt epithelium. Negative epithelium (arrows) and positive neutrophils (arrow heads). c. Normal tissue. Crypts.Negative nuclei and cytoplasm and sparse positive nuclei in the lamina propria of normal colonic mucosa (arrow heads). d. Normal tissue.Lamina propria. Scattered positive nuclei of mononuclear cells in the lamina propria of normal mucosa (arrow heads). e. UC tissue. Purulent material from ulcer. Negative neutrophils in purulent material (arrow heads) positive nuclei of mononuclear cells (arrows).